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This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied , or assumes any legal liability or responsibility for the accuracy , completeness, or usefulness of any information, apparatus, product, or process disclosed , or repre3ents that its use would o'oOI ioofo ioo!le f.'' iv .. t.,ly vwoo.,l) 'i!llols. Rele oe lll.td n:ll ei11 to any specific commercial product, process, or service by trade name, trademark , manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation , or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. r. .. .

Previous work concerning c r o s s -s e c t i o n s e n s i t i v i t y of t h e t r i t i u m breeding r a . t i o showed t h e e f f e c t s of a l t e r i n g a p a r t i a l cross s e c t i o n independently of o t h e r p a r t i a l c r o s s ~e c t i o n s , p e r m i t t i n g t h e tota.1 c r o s s s e c t i o n t o r i s e o r fa.11. The r e s u l t s reported here a r e mostly f o r v a r i a t i o n s ma.de while keeping t h e tota.1 c r o s s s e c t i o n constant. The ca.ses considered were f o r high and low values of t h e c r o s s s e c t i o n s f o r " L i ( n , a ) t , 7~i ( n , n ' f l ) t , and f o r 9 3~b ( n , 2 n ) with compensa.tory changes i n o t h e r c r o s s s e c t i o n s . The g e n e r a l conclusions of previous work have been borne out b o t h qua.lit a t i v e l y and q u a n t i t a . t i v e l y under t h e p r e s e n t more r e a . l i s t i c ground r u l e s . I n a.ddition, r e s u l t s a r e r e p o r t e d f o r a. modif i e d CTR benchmark which ha.s b l a n k e t ma.teria.1 i n p l a c e of t h e g r a p h i t e reflec.t;or. This ca.se shows a drop of 0.13 i n 6~i productions, a. r i s e of 0.02 i n 7~i productions, a.nd a.n i n c r e a s e of 0.15 i n neutron 1ea.kage.

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